Power consumption of the worlds most popular websites calculated on different browsers:

TL;DR; If you’re a MacBook user, you’re losing an average of 1 hour of total battery life by using Chrome. Firefox is a little better, but Safari is the clear winner. You’ll want to use Safari if you want to get the most battery out of your laptop.

Can’t say I disagree with the findings. I use Chrome as my main browser most of the time but it is a resource hog compared to Safari, who has quietly pushed out some great updates over the past year (with more coming this fall).